Yes.
“Pull” mode is excellent for security (ransomware protection). Since BmuS is designed to run locally on the backup device, the logic is quite simple:
If you enter an IP, BmuS might try to run connectivity checks (Ping) or attempt to mount the destination itself, which isn’t needed here.
The Setup: You need to mount your Primary NAS’s SMB share to your Backup NAS’s filesystem first (e.g., via /etc/fstab or OS mount to /mnt/primary_nas).
The Config: In BmuS, you then treat this mount simply as a local folder.
BACKUP_SOURCES="/mnt/primary_nas" (The path to your mounted SMB share)
BACKUP_PATH="/mnt/local_storage" (The local disk on your backup NAS)
Important: Please leave NAS_IP=""empty in your bmus.conf.
Since the mount is handled by the OS, BmuS treats this as a “Local Backup”.